12kV outdoor all-insulation double-fracture load switch

Abstract

The utility model provides a 12kV outdoor all-insulation double-fracture load switch, which comprises a box body and inlet and outlet wire insulation sleeve assemblies at two sides of the box body, and further comprises an arc extinguishing fracture mechanism and a visible fracture mechanism which are positioned in the box body and are connected through a copper bar; the arc extinguishing fracture mechanism and the visible fracture mechanism are respectively connected with the incoming and outgoing line insulating sleeve assembly, and a visible window is arranged at a position, corresponding to the visible fracture mechanism, of the box body; the box body forms a sealing box, the sealing box is filled with air, and an insulating layer is arranged on the outer surface of the sealing box. According to the utility model, the two fractures and the load switch filled with nitrogen are added, SF6 gas is replaced, the vacuum arc extinguish chamber is used for breaking fault current, and the linear arc extinguish chamber is used for providing the visible fractures, so that the problem of insulating media of the load switch is solved, and the characteristics of intrinsic insulation and visible fractures are reserved at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of insulating load switches, in particular to a 12kV outdoor fully insulating double-break load switch. Background Art

[0002] In existing technology, most insulated switches have only one arc-extinguishing circuit breaker. Consequently, three-phase insulated switches, typically used for outdoor high-voltage and medium-high voltage applications, cannot be monitored for switching conditions within the arc-extinguishing chamber, potentially leading to safety issues. Furthermore, the market is rapidly moving away from SF6, with some regions requiring the removal of any SF6 insulating medium, including outdoor load breakers. The market is in need of environmentally friendly switchgear to fill the gap left by existing SF6 products. Utility Model Content

[0003] The purpose of the utility model is to provide a 12kV outdoor fully insulated double-break load switch, which avoids the medium problem of thermal capacity by setting two breaks and utilizing vacuum arc extinguishing. At the same time, while maintaining all the characteristics of the existing equipment, the original SF6 insulating medium is replaced by natural gas.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions.

[0005] A 12kV outdoor fully insulated double-break load switch, comprising a box body and inlet and outlet insulation bushing assemblies on both sides of the box body, and also comprising an arc-extinguishing break mechanism and a visible break mechanism located within the box body, the arc-extinguishing break mechanism and the visible break mechanism being connected by a copper busbar;

[0006] The arc extinguishing fracture mechanism and the visible fracture mechanism are respectively connected to the inlet and outlet insulation bushing assemblies, and the box body is provided with a visual window at the corresponding position of the visible fracture mechanism;

[0007] The box body forms a sealed box, the sealed box is filled with air, and an insulating layer is provided on the outer surface of the sealed box.

[0008] Furthermore, it also includes a driving mechanism for driving the arc extinguishing break mechanism and the visible break mechanism to open or close the switch, and the driving mechanism passes through the box and is connected to the operating mechanism at the end.

[0009] Furthermore, the driving mechanism includes a driving main shaft passing through a plurality of arc extinguishing and disconnecting mechanisms and a driven main shaft passing through a plurality of visible fracture mechanisms, and the driving main shaft and the driven main shaft are both located in the box.

[0010] Furthermore, an active balance wheel and a driven balance wheel are fixed to the driving main shaft and the driven main shaft respectively, and the operating mechanism is linked with the active balance wheel. When the active balance wheel moves to the touch point, it drives the driven main shaft to move to realize opening.

[0011] Furthermore, when the active balance wheel swings, it drives the driving main shaft to form a movement path close to the arc extinguishing and breaking mechanism or away from the arc extinguishing and breaking mechanism.

[0012] Furthermore, the active balance wheel is partially recessed to form an interference portion, and the outer side of the driven balance wheel is provided with a contact fitting portion that contacts and abuts against the interference portion.

[0013] Furthermore, a groove body with a guide path is formed at the interference portion, and a fitting path matching the guide path is formed at the outer periphery of the abutting fitting portion.

[0014] Furthermore, the driving spindle is an insulating driving shaft, and the driven spindle is a conductive rod.

[0015] Furthermore, there are at least three groups of the incoming and outgoing line insulating sleeve assemblies, and the two insulating sleeves of each group of the incoming and outgoing line insulating sleeve assemblies are respectively connected to the arc extinguishing break mechanism and the visible break mechanism, and the projection of the visual window on the box is located on the visible break mechanism.

[0016] Furthermore, the visual window is a light-transmitting window.

[0017] The beneficial effects of the utility model are as follows:

[0018] In the present invention, two fractures are formed, one for arc extinguishing and the other for visible fracture. Vacuum arc extinguishing is used to circumvent the medium problem of heat capacity, while the isolation cabin design is used to improve the tolerance of electric field stress, thereby reducing the overall size of the equipment.

[0019] In the utility model, a visual window is used to realize the status of the vacuum interrupter after arc extinguishing and closing. In particular, the outside of the vacuum interrupter is completely blocked, and it is impossible to see whether its physical structure is separated in time, and it can only be judged indirectly through the moving contact, which affects observation and use. The utility model solves the above problem.

[0020] This utility model utilizes a sealed enclosure design to achieve fully insulated cable pre-crimps, eliminating exposed live points. This eliminates exposed points during switch operation, minimizing the risk of line tripping caused by small animals, branches, and other hazards. Full insulation also provides enhanced safety for maintenance personnel during switch repairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is one of the structural schematic diagrams of a 12kV outdoor fully insulated double-break load switch provided by the utility model;

[0022] Figure 2 This is the second structural diagram of a 12kV outdoor fully insulated double-break load switch provided by the utility model;

[0023] Figure 3 This is a main view of a 12kV outdoor fully insulated double-break load switch provided by the utility model;

[0024] Figure 4 A cross-sectional view of a 12kV outdoor fully insulated double-break load switch provided by the utility model;

[0025] Figure 5 A schematic diagram of the structure of the driving mechanism provided by the utility model;

[0026] In the picture:

[0027] 100. Box body; 110. Visible window; 200. Inlet and outlet insulating bushing assembly; 300. Arc-extinguishing break mechanism; 310. Force spring; 320. Arc-extinguishing bushing; 400. Visible break mechanism; 410. Visible break bushing; 420. Insulating shaft; 500. Driving mechanism; 510. Driving spindle; 520. Driven spindle; 530. Active balance wheel; 531. Interference part; 540. Driven balance wheel; 541. Abutment and fitting part; 600. Operating mechanism; 610. Energy storage spring; 700. Copper busbar. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0029] Refer to the attached Figure 1-5 As shown, a 12kV outdoor fully insulated double-break load switch in this embodiment includes a box body 100 and an incoming and outgoing line insulating sleeve assembly 200 on both sides of the box body 100. In this embodiment, it also includes an arc-extinguishing break mechanism 300 and a visible break mechanism 400 located in the box body 100, and the arc-extinguishing break mechanism 300 and the visible break mechanism 400 are connected by a copper bus 700; in this embodiment, a double-break design of arc-extinguishing break and visible break is adopted, and then the vacuum interrupter is responsible for interrupting the fault current and the straight line interrupter is responsible for providing the visible break.

[0030] In this embodiment, in order to facilitate observation, the arc extinguishing break mechanism and the visible break mechanism are respectively connected to the incoming and outgoing line insulating sleeve assembly 200, and a visual window 110 is provided at the corresponding position of the box body 100 and the visible break mechanism 400; the internal disconnection or closing status can be observed through the visual window.

[0031] In this embodiment, the box body 100 forms a sealed box, the sealed box 100 is filled with air, and an insulating layer is provided on the outer surface of the sealed box 100.

[0032] In this embodiment, the entire box 100 adopts IP68 protection grade application; all prefabricated welding surfaces (except the cover plate) adopt a robot double-sided welding process to ensure airtightness; the box can be vacuumed separately, and the box withstands negative and positive pressure tests during production; the studs used to fix the sleeve, window and other seals are all welded to the surface of the box, which is sufficient to withstand the stress of the fasteners applied with torque.

[0033] Furthermore, the inlet and outlet bushings in this embodiment utilize epoxy resin as the primary insulation and silicone rubber overmolding as the external insulation. The integrated epoxy casting process ensures airtightness between the conductor and insulation. A slot-based, height-limited sealing mechanism, with multiple flanges on the sealing surface, ensures excellent sealing performance. The outer bushing's connection to the overhead insulation is covered with a factory-prefabricated insulating outer sheath, which is both waterproof and weather-resistant.

[0034] To achieve control of a single switch, this embodiment also includes a drive mechanism 500 that drives the arc-extinguishing breaker mechanism 300 and the visible breaker mechanism 400 to open or close. The drive mechanism 500 passes through the housing 100 and is connected to an operating mechanism 600 at the end. In this embodiment, the two switch mechanisms are controlled directly by the operating mechanism 600 outside the housing. This achieves the goal of controlling two breaker mechanisms with a single mechanism while maintaining a simple structure.

[0035] As shown in the accompanying drawings, the drive mechanism 500 specifically includes a driving spindle 510 that passes through several arc-extinguishing disconnect mechanisms 300 and a driven spindle 520 that passes through several visible break mechanisms 400. Both the driving spindle 510 and the driven spindle 520 are located within the housing 100. By connecting multiple drives to a single spindle, multiple break switches of the same type within the housing are synchronously controlled, achieving a robust structure by connecting multiple break switches.

[0036] Specifically, the driving spindle 510 and the driven spindle 520 are respectively secured with an active balance wheel 530 and a passive balance wheel 540. The operating mechanism 600 is linked to the active balance wheel 510. When the active balance wheel 510 moves to the contact point, it drives the passive spindle 520 to open the switch. In this embodiment, the balance wheel is controlled so that when the contact is established at a specific position, the second switch is actuated. Compared to operating two switches simultaneously, this arrangement offers greater applicability. In particular, the linkage arrangement allows for different opening and closing times for the different switches.

[0037] In this embodiment, in actual use, the active balance wheel 530 swings, driving the driving main shaft 510 along the arc extinguishing and breaking mechanism 300, thereby forming a movement path close to or away from the arc extinguishing and breaking mechanism, and reciprocating in this movement path to achieve opening or closing.

[0038] To ensure the driving spindle 510's ingenious control over the driven spindle 520, the active balance wheel 530 is partially recessed to form an interference portion 531. The driven balance wheel 540 is provided with an abutting portion 541 on its outer side, which contacts and abuts the interference portion 531. In actual operation, when the interference portion 531 moves to the abutting portion 541, an interference force is generated between the two. Consequently, the movement of the active balance wheel 530 interferes with and drives the driven balance wheel 540, which in turn drives the driving spindle 510 and the driven spindle 520 to respectively drive the two disconnect mechanisms to perform the corresponding opening or closing operations.

[0039] In order to ensure constant connection, a groove with a guide path is formed at the interference portion 531, and a fitting path matching the guide path is formed on the periphery of the abutting and fitting portion 541. When the groove and the abutting and fitting portion 541 are perfectly matched, their movement is controlled.

[0040] In this embodiment, when applied to a specific product, the driving spindle 510 is an insulating driving spindle, and the driven spindle 520 is a conductive rod. By utilizing the difference between the insulating and conductive parts, the insulating part can be used for high current and voltage opening. When closing, the operating mechanism 600 is used to cause the parts to rotate in opposite directions. At this time, the active balance wheel 530 and the driven balance wheel 530 come into contact, thereby moving synchronously. Due to the action of the conductive rod, the magnetic properties of the visible break mechanism are enhanced, making it easier to conduct electricity with the circuit in the inlet and outlet insulation bushing assembly 200. As a result, the visible break mechanism 400 completes the closing process first, followed by the arc extinguishing break mechanism 300.

[0041] In order to better distribute the energy for starting the circuit breaker opening, an energy storage spring 610 is also provided at the operating mechanism 600. The energy storage spring 610 generates compression energy of the spring when the operating mechanism 600 rotates. For example, a torsion spring is used. When rotating, torque energy is generated, which is then transmitted to the driving main shaft 510. At this time, a force spring can be added to the arc extinguishing port mechanism 300 so that it can receive the force released by the energy storage spring as soon as possible to speed up the circuit breaker opening.

[0042] In this embodiment, the arc-extinguishing breaker mechanism 300 includes an arc-extinguishing sleeve 320 connected to the input and output line insulating sleeve assembly 200, an arc-extinguishing sleeve connected to the copper bus 700, and then a force-bearing spring partially fixed in the arc-extinguishing sleeve is sleeved on the driving main shaft 510 through an insulating part to complete the entire assembly.

[0043] Furthermore, the visible break mechanism 400 includes a visible break sleeve 410 connected to the inlet and outlet insulating sleeve assembly 200, and a portion penetrating into each visible break sleeve 410 and then connected to a driven main shaft composed of a conductive rod through an insulating shaft 420.

[0044] In this embodiment, three groups of arc extinguishing break mechanisms 300 and three groups of visible break mechanisms 400 are set in the box body 1. At this time, the switches formed by the arc extinguishing break mechanisms on the same side are synchronously opened and closed, and the switches of the three visible break mechanisms on the other side are synchronously opened and closed. The incoming and outgoing line insulating bushing assembly includes two incoming and outgoing line insulating bushings, which are respectively connected to the arc extinguishing break mechanism 300 and the visible break mechanism 400. In this embodiment, the arc extinguishing break mechanism 300 is a vacuum environment, forming a vacuum switch.

[0045] In this embodiment, in order to ensure that the entire visible fracture opening and closing state can be seen, a larger visual window 110 is selected, and its entire projection covers the visible fracture mechanism.

[0046] The two insulating sleeves of each group of the incoming and outgoing line insulating sleeve assemblies are respectively connected to the arc extinguishing break mechanism and the visible break mechanism, and the projection of the visual window on the box is located on the visible break mechanism.

[0047] In order to be able to see the opening and closing of the box in time, the visual window is a light-transmitting window.

[0048] Refer to the attached Figure 1-4 As shown, this embodiment is suitable for load switches primarily powered by natural gas. Specifically, while maintaining all the characteristics of existing equipment, the original SF6 insulating medium in the box is replaced with natural gas. Of course, due to the different insulating medium, in order to achieve the same functions as the original equipment, specific technologies are required to implement these functions.

[0049] This utility model adopts a dual-break design, with a vacuum interrupter responsible for interrupting the fault current and a linear interrupter responsible for providing a visible break. The vacuum interrupter assembly achieves closing and opening operations through an operating mechanism composed of an operating lever. This mechanism is also mechanically sequence-locked with the linear interrupter mechanism to determine the operating sequence of the two breaks.

[0050] In this embodiment, the entire device features a fully insulated, fully enclosed design with visible disconnects across all three phases. Specifically, the housing is touchable and features a reliable grounding point. The three-phase input and output cables are fully insulated and pre-crimped, eliminating exposed live points. The switch has no exposed points during operation, minimizing the risk of line tripping caused by small animals, tree branches, and other hazards. Full insulation also provides enhanced safety for maintenance personnel during switch repairs. SF6 is no longer used as the insulating medium.

[0051] In this embodiment, the operating mechanism rotates outside the box, so that the active balance wheel drives the driving main shaft to move inside the box to realize opening or closing of the switch.

[0052] In this embodiment, the two breaking mechanisms are detachably connected to the copper busbar. During their movement or rotation, they will be disconnected from the copper busbar, and the copper busbar can be fixed in the box.

[0053] Furthermore, a pressing piece is provided on the driving main shaft, which abuts against the corresponding piece on the driven main shaft when the switch is closed to achieve fixation, and moves away when the switch is opened.

[0054] In this embodiment, the closing or opening of the arc extinguishing breaker mechanism and the closing and opening of the visible breaker mechanism both refer to the contact or separation of the contacts between the breaker and the incoming and outgoing line insulating bushing assembly.

[0055] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0057] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A 12kV outdoor fully insulated double-break load switch, comprising a box body and inlet and outlet insulation bushing assemblies on both sides of the box body, characterized in that: It also includes an arc extinguishing fracture mechanism and a visible fracture mechanism located in the box body, wherein the arc extinguishing fracture mechanism and the visible fracture mechanism are connected by a copper busbar; The arc extinguishing fracture mechanism and the visible fracture mechanism are respectively connected to the inlet and outlet insulation bushing assemblies, and the box body and the visible fracture mechanism are provided with a visual window; The box body forms a sealed box, the sealed box is filled with air, and an insulating layer is provided on the outer surface of the sealed box.

2. A 12kV outdoor fully insulated double-break load switch according to claim 1, characterized in that: It also includes a driving mechanism for driving the arc extinguishing break mechanism and the visible break mechanism to open or close the switch. The driving mechanism passes through the box and is connected to the operating mechanism at the end.

3. A 12kV outdoor fully insulated double-break load switch according to claim 2, characterized in that: The driving mechanism comprises a driving main shaft passing through a plurality of arc extinguishing and disconnecting mechanisms and a driven main shaft passing through a plurality of visible fracture mechanisms, and both the driving main shaft and the driven main shaft are located in the box.

4. A 12kV outdoor fully insulated double-break load switch according to claim 3, characterized in that: An active balance wheel and a driven balance wheel are fixed to the driving main shaft and the driven main shaft respectively. The operating mechanism is linked with the active balance wheel. When the active balance wheel moves to the touch point, it drives the driven main shaft to move to realize opening.

5. A 12kV outdoor fully insulated double-break load switch according to claim 4, characterized in that: When the active balance wheel swings, it drives the main shaft to form a movement path close to the arc extinguishing and breaking mechanism or away from the arc extinguishing and breaking mechanism.

6. A 12kV outdoor fully insulated double-break load switch according to claim 4, characterized in that: The active balance wheel is partially recessed to form an interference portion, and the outer side of the driven balance wheel is provided with a contact fitting portion that contacts and abuts against the interference portion.

7. A 12kV outdoor fully insulated double-break load switch according to claim 6, characterized in that: A groove body with a guide path is formed at the interference portion, and a fitting path matching the guide path is formed at the outer periphery of the abutting fitting portion.

8. The 12kV outdoor fully insulated double-break load switch according to claim 3, characterized in that: The driving main shaft is an insulating driving shaft, and the driven main shaft is a conductive rod.

9. A 12kV outdoor fully insulated double-break load switch according to claim 1, characterized in that: There are at least three groups of the inlet and outlet insulating sleeve assemblies, and the two insulating sleeves of each group of the inlet and outlet insulating sleeve assemblies are respectively connected to the arc extinguishing break mechanism and the visible break mechanism, and the projection of the visual window on the box is located on the visible break mechanism.

10. A 12kV outdoor fully insulated double-break load switch according to claim 9, characterized in that: The visual window is a light-transmitting window.

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